To make solar power viable, we need a solution for overnight energy storage.
Batteries are complicated.
Do you know what isn't? Water go up. 
To make solar power viable, we need a solution for overnight energy storage.
Batteries are complicated.
Do you know what isn't? Water go up.
Turbines are precision machines. And if we're talking utility scale installations here, we want an upper reservoir measured in thousands of cubic meters, not liters.